/*
console.log('连接');
var elFirstname=document.getElementById('first_name'),
elMsg_first_name=document.getElementById('first_name_feedback');

function checkFirstname(username){
    if(username==null||username==''||username.length==0){
        elMsg_first_name.textContent="姓名不能为空";
        return;
    }
    elMsg_first_name.textContent='';
}

 $('#first_name').on('blur',function (){
     console.log('调用');
     var username=elFirstname.value.trim();
     checkFirstname(username);
 });
*/
